*2. I bought a tacho on ebay for my 2000 Prostar and found it was for the later brainbox. Tacho worked fine but nothing showed in the lcd screen. Is it the original gauge? There must be a separate wire for current to the gauge, as I believe the ignition only has to be turned on to clock up hours.

Yes but the ECU will tell what hours were run at what RPM's...iirc.

__________________...A bad day water skiing still beats a good day at work...1995 Pro Star 205....